Flow tube



FIG. 1 is a perspective view of a first embodiment of the flow tube;

FIG. 2 is a right side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is an end view thereof;

FIG. 5 is a perspective view of a second embodiment of the flow tube;

FIG. 6 is a right side view;

FIG. 7 is a top view thereof; and,

FIG. 8 is an end view thereof. 

The ornamental design of a flow tube, as shown and described. 